Microsoft resolves WSUS test detectoid issue after update glitch

The article discusses recent disruptions in WSUS (Windows Server Update Services) affecting Windows updates across corporate networks, beginning on July 13, 2026. Issues stemmed from a buildup of mis-published test detectoids, which hindered synchronization and led to update scan failures. Microsoft identified the problem and implemented a service-side fix on July 18, restoring normal operations.

A manual cleanup process is outlined for affected servers, emphasizing the need for database backups before executing cleanup queries. Administrators are encouraged to reindex databases afterward and monitor for potential disk space issues.